Particle Size Distributions in Turbulent Premixed Ethylene Flames Crossing the Soot Inception Limit
File(s)
Accepted version
Author(s)
Shariatmadar, Seyedhamed
Aleiferis, Pavlos
Lindstedt, Rune
Type
Journal Article
Abstract
The current study presents novel experimental data on soot particle size distributions (PSDs) with mobility diameters in the size range 4 ≤ Dm [nm] ≤ 230 obtained from four premixed turbulent ethyleneair flames crossing the soot inception limit. The flames are stabilised against hot combustion products
from nitrogen diluted hydrogen flames in a back-to-burnt (or fresh-to-burnt) opposed jet configuration.
The burner features fractal grid generated turbulence to provide accurate control of the turbulence. A
scanning mobility particle sizer (SMPS) equipped with nano- and long–DMA columns coupled with a
dual dilution port quartz probe is used and a comprehensive analysis of optimal sampling conditions
to minimise particle losses is presented. Spatially resolved data along the stagnation point streamline
is obtained to show the evolution of PSDs through the turbulent flame brush. It is shown that turbulent transport distributes soot particles across the mixing layer between the two jets with the maximum
median and mean mobility diameters found close to the stagnation point. The impact of the estimated
total mean rate of strain (420 ≤ aT [s−1] ≤ 610) and equivalence ratio (1.8 ≤ φUN ≤ 2.2) on PSDs is also
quantified.
from nitrogen diluted hydrogen flames in a back-to-burnt (or fresh-to-burnt) opposed jet configuration.
The burner features fractal grid generated turbulence to provide accurate control of the turbulence. A
scanning mobility particle sizer (SMPS) equipped with nano- and long–DMA columns coupled with a
dual dilution port quartz probe is used and a comprehensive analysis of optimal sampling conditions
to minimise particle losses is presented. Spatially resolved data along the stagnation point streamline
is obtained to show the evolution of PSDs through the turbulent flame brush. It is shown that turbulent transport distributes soot particles across the mixing layer between the two jets with the maximum
median and mean mobility diameters found close to the stagnation point. The impact of the estimated
total mean rate of strain (420 ≤ aT [s−1] ≤ 610) and equivalence ratio (1.8 ≤ φUN ≤ 2.2) on PSDs is also
quantified.
Date Issued
2022-09
Date Acceptance
2021-12-27
Citation
Combustion and Flame, 2022, 243, pp.1-20
ISSN
0010-2180
Publisher
Elsevier
Start Page
1
End Page
20
Journal / Book Title
Combustion and Flame
Volume
243
Copyright Statement
© 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Commission of the European Communities
Identifier
https://www.sciencedirect.com/science/article/pii/S0010218021007215?via%3Dihub
Grant Number
690724
Subjects
Energy
0902 Automotive Engineering
0904 Chemical Engineering
0913 Mechanical Engineering
Publication Status
Published
Date Publish Online
2022-01-13